package com.sky.aop;


import com.sky.amnotaion.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import com.sun.org.apache.bcel.internal.generic.IF_ACMPEQ;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Component
@Slf4j
@Aspect
public class AutoFillAspect {
    /**
     *  切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.amnotaion.AutoFill)")
    public void autoFollPointCut(){}

    @Before("autoFollPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开启公共字段自动填充");
        //获取方法签名对象,强转为MethodSignature对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获取方法上的注解
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        //获取数据库的操作类型
        OperationType operationType = annotation.value();
        //获取当前被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        //获取到第一个参数
        Object arg = args[0];
        //准备赋值的数据
        //把这些固定的时间找到
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型，为对应的属性通过反射来赋值
        //如果是添加操作方法
        if (operationType == OperationType.INSERT){
            Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(arg,now);
            setCreateUser.invoke(arg,currentId);
            setUpdateTime.invoke(arg,now);
            setUpdateUser.invoke(arg,currentId);
        }


        if(operationType == OperationType.UPDATE) {
            Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象属性赋值
            setUpdateTime.invoke(arg,now);
            setUpdateUser.invoke(arg,currentId);
        }
    }
}
